Audio signal processing apparatus with optimization process
CA 2107320 C · Owner: Mitsubishi Denki Kabushiki Kaisha · Inventors: Hibino, Masahiro; Sato, Masanobu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An audio signal processing apparatus performs the optimization process of an audio signal reproduced from a medium such as a compact disk. Each of low-pass and high-pass filters effects a band division on the audio signal. A peak analyzer detects the peak value of a low audio-range signal and outputs a control signal corresponding to the detected peak value to a voltagecontrolled amplifier. The voltage-controlled amplifier adjusts the level of the low audio-range signal in accordance with the control signal. A mixture and distribution circuit combines the output of the voltagecontrolled amplifier and the output of the high-pass filter and distributes the composite signal to corresponding …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed September 29, 1993 and granted March 25, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 29, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 29, 2015.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
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Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.